Frank Hennessy tells Roy Noble the story of one of Cardiff's most famous residents who has gone back on show at the National Museum.
Billy the Seal was caught in a fishing net off the coast of Ireland in 1912 and was discovered when the catch was brought back to Cardiff.
The animal was given a home in a pool at Victoria Park and became a popular attraction.
When Billy died in 1939 experts at the National Museum examined the body and found that he was a she.
The skeleton has been put back on show at the National Museum in Cathays Park as part of the new Clore Discovery Centre.
A statue of Billy can also be seen by the pool in Victoria Park.